| 摘要 |
PROBLEM TO BE SOLVED: To provide an invert arranged at a specified place, for which an inflow pipe can be installed at a free position (a position except the discharge opening of the invert) to some extent without largely damaging the hydraulic gradient of a sewage main pipe. SOLUTION: An outflow 3 is formed on the inclined lower-section side of an invert body 2 in which a top face 5 is formed so as to be tilted in the fixed direction while projections 6 for regulating a flow are formed radially to the top face 5 at proper intervals from the outflow 3, cross sectional shapes among the projections 6 for regulating the flow are formed in an arcuate shape or a semicircular shape, and grades among the projections 6 for regulating the flow rate made the same as that of the top face 5 of the invert body 2.
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